FILE - In this Jan. 16, 2015 file photo, President Barack Obama meets with British Prime Minister David Cameron, in the Oval Office of the White House in Washington. U.S. Sen. Lindsey Graham, a leading Republican critic of Obama's foreign policy, is pushing new sanctions against Iran over its nuclear program, unswayed by a White House veto threat and lobbying by Britain's leader. (AP Photo/Carolyn Kaster, File) (The Associated Press)

VIENNA – A confidential U.N report says Iran is honoring its commitment not to expand atomic activities that could be used to make weapons while it negotiates with six world powers on a nuclear deal.